I bought this Colorado along with the River to compare. The "cotton" lining was really coarse and scratchy. If you slept in the bag with shorts, you'd probably get a friction rash! With pajamas on, shifting positions was hard because the lining stuck to you like velcro. Sadly, I returned this bag and ordered 2 more Rivers! The zip together feature was nice, though. I would still recommend this bag if you're budget minded. Everything about the bag is wonderful (except for the lining).